Carbolex Shell, Thinsulate Insulation * Offers up to 9 hours of comfortable warmth from harsh winter weather * Includes two 7.42V 2.2ah rechargeable lithium-ion and charger; battery that features built-in 4 level thermo-regulating controls and provides up to 10 hours of comfortable warmth * Hand wash or machine-wash on the gentle/delicate cycle using the warm-water setting (water temperature below 50°F) and a mild detergent. Do not use bleach. Remove from washer and hang/air dry. * China. Do not wring out or twist the garments, this will damage the heating elements. Do not tumble dry, iron or dry clean.